import re

from django.conf import settings
from django_redis import get_redis_connection
from rest_framework import serializers
from celery_tasks.email.tasks import send_verify_email
from goods.models import SKU
from users import constants
from users.models import User, Address
from django.core.mail import send_mail


class CreateUserSerializer(serializers.ModelSerializer):
    """创建用户序列化器"""
    password2 = serializers.CharField(label="确定密码", write_only=True)
    sms_code = serializers.CharField(label="短信验证码", write_only=True)
    allow = serializers.CharField(label="同意协议", write_only=True)

    class Meta:
        model = User
        fields = ('id', 'username', 'password', 'password2',
                  'sms_code', 'mobile', 'allow')
        extra_kwargs = {
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        """验证手机号"""
        if not re.match(r'^(13\d|14[5|7]|15\d|166|17[3|6|7]|18\d)\d{8}$', value):
            raise serializers.ValidationError('手机号格式错误')
        # 手机号是否重复
        count = User.objects.filter(mobile=value).count()
        if count > 0:
            raise serializers.ValidationError('手机号以存在')
        return value

    def validated_allow(self, value):
        """检验用户是否同意协议"""
        if value != 'true':
            raise serializers.ValidationError('请同意协议')
        return value

    def validate(self, attrs):
        # 判断用户名是否只为数字
        if attrs['username'].isdigit():
            raise serializers.ValidationError('用户名不能只为数字！')
        # 判断两次密码是否一致
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError('密码不一致')

        # 判断短信验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if real_sms_code is None:
            raise serializers.ValidationError('无效的验证码已经过期')
        if attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('短信验证码输入错误')
        return attrs

    def create(self, validated_data):
        """创建用户"""
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']
        user = User.objects.create_user(**validated_data)
        from rest_framework_jwt.settings import api_settings
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        # 生成载荷
        payload = jwt_payload_handler(user)
        # 生成jwt token
        token = jwt_encode_handler(payload)

        # 给user对象增加属性token，保存服务器签发jwt token数据
        user.token = token

        return user


class UserDetailSerializer(serializers.ModelSerializer):

    """
    用户信息序列化器
    """
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')


class EmailSerializer(serializers.ModelSerializer):
    """用户邮箱设置序列化器"""

    class Meta:
        model = User
        fields = ('id', 'email')

    def update(self, instance, validated_data):
        """
                设置user用户的邮箱并发送邮箱验证邮件
                instance: 创建序列化器时传递对象
                validated_data: 验证之后的数据
                """
        # 设置用户的邮箱
        email = validated_data['email']
        instance.email = email
        instance.save()

        # 生成邮箱验证的链接地址: http://www.meiduo.site:8080/success_verify_email.html?user_id=<user_id>
        # 如果链接地址中直接存储用户的信息，可能会造成别人的恶意请求
        # 在生成箱验证的链接地址时，对用户的信息进行加密生成token，把加密之后token放在链接地址中
        # http://www.meiduo.site:8080/success_verify_email.html?token=<token>
        verify_url = instance.generate_verify_email_url()

        # 发出发送邮件的任务消息
        # send_verify_email.delay(email, verify_url)
        subject = "美多商城邮箱验证"
        html_message = '<p>尊敬的用户您好！</p>' \
                       '<p>感谢您使用美多商城。</p>' \
                       '<p>您的邮箱为：%s 。请点击此链接激活您的邮箱：</p>' \
                       '<p><a href="%s">%s<a></p>' % (email, verify_url, verify_url)

        send_mail(subject, '', settings.EMAIL_FROM, [email], html_message=html_message)

        return instance


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证手机号
        """
        if not re.match(r'^(13\d|14[5|7]|15\d|166|17[3|6|7]|18\d)\d{8}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        """
        保存
        """
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title',)


class AddUserBrowsingHistorySerializer(serializers.Serializer):
    """添加历史记录序列化器"""
    sku_id = serializers.IntegerField(label="商品SKU编号", min_value=1)

    def validate_sku_id(self,value):
        try:
            SKU.objects.get(id=value)
        except Exception as e:
            raise serializers.ValidationError('该商品不存在')
        return value

    def create(self, validated_data):
        """保存"""
        user_id = self.context['request'].user.id

        sku_id = validated_data['sku_id']

        redis_conn = get_redis_connection("history")
        pl = redis_conn.pipeline()
        # 移除已经存在的本商品浏览记录
        pl.lrem("history_%s" % user_id, 0, sku_id)
        # 添加新的浏览记录
        pl.lpush("history_%s" % user_id, sku_id)
        # 只保存最多5条记录
        pl.ltrim("history_%s" % user_id, 0, constants.USER_BROWSING_HISTORY_COUNTS_LIMIT - 1)

        pl.execute()

        return validated_data
